External PTO Installation Instructions
What: Instructions for installing external PTO to your TennaCANbus tracker.
Who: Tenna hardware should only be installed by a qualified mechanic.
Important! Assets that capture PTO through the Electronic Control Unit (ECU) DO NOT require these steps.
Tools and Materials Required
- 12-volt Bosch style relay (EPauto AE-01A-4#FL01)
- IN4007 diode
- Misc. heat-shrink and electric terminals
- Length of 18 gauge wire
- Wire strippers/crimpers
- Cable ties
Option 1: External Electrically-Controlled PTO
Positive activated, switch-controlled PTO (non-relay method)
- Connect the tracker harness’s purple PTO wire to the PTO’s positively-activated switch (ON/OFF terminal of the switch).
NOTE: The Purple PTO wire should connect to the side of the switch that is de-energized when the switch is OFF, not the constant power side of the switch so that activating the switch energizes the PTO sensor wire.
Option 2: External Manual Style PTO
Normally-open, switched ground, sensor mounted on transmissions PTO (relay method)
The Relay functions as a polarity inverter to sense the switched ground, activating a positive signal to the purple wire to signal the tracker that PTO is engaged. No power is drawn when the vehicle is shut down, protecting the battery.
- Connect relay terminal #30/blue and #86/white together in one end of a butt connector (see Figure 1).
- Connect a white, 6-inch wire lead to the cathode of a IN4007 diode. See detail below. The diode protects any lamps in the circuit by absorbing the negative voltage kickback when the relay shuts off. The diode is wired in reverse polarity to the voltage used to energize the relay for this reason.
NOTE: Ensure that the diode is facing the proper relay terminal. A reversed diode prevents the relay from operating.
- Connect the diode’s cathode wire (negative terminal) (from step 2) to the constant 12v or 24v power source (preferably to the fuse panel) using an inline 3-amp fuse. This protects against failure.
NOTE: If there is a PTO light, the diode’s cathode wire (white wire lead) can be connected to the power side of the PTO light instead of the fuse panel. The diode protects the lamp from blowout from the relay coil kickback voltage that occurs on shutoff from the PTO.
- Connect the anode (positive terminal) of the diode to the relay terminal #85/black wire, along with another 6-inch, black wire, lead (see Figure 1).
- Connect the diode’s anode, black lead (connected to the diode/#85 terminal), to the normally open switch that runs to the PTO.
NOTE: If there is a PTO light, the diode’s cathode (black wire) can be connected to the ground side of the light wire running down to the normally open PTO switch.
- Connect relay terminal #87/PTO wire (yellow) directly to the PTO wire (purple) on the tracker harness’s purple wire (see Figure 3).
- Relay terminal #87A/red wire is not used. Isolate this wire by cutting off any exposed copper and insulating with several wraps of electrical tape.
- Ensure that all connections are stable, insulated, and have no exposed strands or fraying.
- Install the assembly adjacent to the asset’s DLC and secure in place against motion, damage or exposure to elements.
Option 3: External Electric Hydraulic Pump PTO
Switched Positive Operation (non-relay method)
- Install the correct size electrical terminal to the tracker harness’s PTO input wire (purple wire)
- Install the PTO (purple wire) onto the preferred connection:
- To the push button control switch solenoid small terminal that activates the pump (See Figure 4: red wire)
- To main power wire on solenoid that activates the pump (See Figure 4: large diameter black wire)
- Once the tracker harness’s purple wire is wired to the PTO device, install the white 20 pin connector on the wire harness into the tracker’s white 20 pin socket, and the other end into the asset’s DLC.
- Re-check all connections and mounting of cabling for safety.
- The installation is ready for service.